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Mapping phonetic perception by infants and adults using Cortical Auditory Evoked Potentials| old_uid | 10024 |
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| title | Mapping phonetic perception by infants and adults using Cortical Auditory Evoked Potentials |
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| start_date | 2015/10/12 |
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| schedule | 11h |
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| online | no |
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| details | Invité par l'équipe Parole. |
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| summary | Measurements of infant speech perception are very time intensive, typically allowing for only isolated phonetic contrasts to be investigated in a single experiment (e.g., beat-boot). This talk will discuss a more efficient technique that we’ve developed to map perception in larger multidimensional phonetic spaces (e.g., a set of 8 English vowels). Listeners hear random sequences of concatenated vowels or fricatives, with stimulus changes up to three times per second (i.e., about 3000 changes within a typical 15-minute infant testing session). We use EEG to measure the magnitude of the neural response to each stimulus change, and generate perceptual maps based on these responses using multidimensional scaling (MDS). The results demonstrate that 4-5 month old infants have MDS spaces that closely match acoustic differences, but the responses selectively increase for nearby phonetic contrasts by 8-11 months. In adults, the MDS spaces reflect a combination of auditory sensitivity and cross-language differences. This technique thus appears to be successful for creating multidimensional perceptual maps that assess the developing auditory system and emerging phonetic categories. |
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| responsibles | Rämä, Izard |
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